HKS METAL CATALYZER FOR TOYOTA GR YARIS GXPA16 33005-AT011

 

HKS METAL CATALYZER FOR TOYOTA GR YARIS GXPA16 33005-AT011

The HKS Metal Catalyzer (33005-AT011) is a high-flow sports catalytic converter and front pipe designed for the Toyota GR Yaris GXPA16 with the G16E-GTS 1.6L turbo engine. 

It replaces the factory catalytic converter to improve exhaust flow while still maintaining emissions purification. 

Key Features

• High-flow metal catalyst core (150 cell)
  Replaces the restrictive OEM ceramic catalyst (600/300 cell density), greatly reducing exhaust backpressure.  
• Dual metal catalyst design
  Both primary and secondary cats use 150-cell metal cores for better flow and durability.  
• Larger pipe diameter
  Enlarged from 70 mm (stock) to ~75 mm for higher exhaust volume and faster turbo response.  
• Performance gain
  With stock muffler, power increases about +10.6 PS and +19.5 Nm.  
• Heat-shield compatible
  Designed so the OEM heat shield can still be installed.  
• Premium build quality
  Fully TIG-welded and buff-polished stainless construction.  

Technical Comparison (Stock vs HKS)

Specification	Stock GR Yaris	HKS Metal Catalyzer
1st Catalyst Cell Density	600 cpsi	150 cpsi
2nd Catalyst Cell Density	300 cpsi	150 cpsi
Max Pipe Diameter	70 mm	~74.7- 75 mm
Idle Sound	59 dB	59 dB
Rev Sound	79 dB	80 dB

Meaning:

• Much less restriction for turbo spool
• Slightly louder and deeper exhaust note
• Improved mid-range torque and top-end power

Fitment

• Vehicle: Toyota GR Yaris (GXPA16)
• Engine: G16E-GTS 1.6L 3-cyl turbo
• Model years: 2020–March 2024 (not compatible with newer post-2024 revision models).  

✅ Best used with:

• HKS Super Turbo Muffler
• HKS Legamax Premium exhaust
• ECU tune or intake upgrade

Together these mods unlock significantly more performance from the GR Yaris turbo system.

HKS METAL CATALYZER FOR TOYOTA GR YARIS GXPA16 33005-AT011